diff --git a/src/modules/attitude_estimator_q/CMakeLists.txt b/src/modules/attitude_estimator_q/CMakeLists.txt
index 83f17d3e81..115d0820ba 100644
--- a/src/modules/attitude_estimator_q/CMakeLists.txt
+++ b/src/modules/attitude_estimator_q/CMakeLists.txt
@@ -34,7 +34,8 @@ set(MODULE_CFLAGS)
 px4_add_module(
 	MODULE modules__attitude_estimator_q
 	MAIN attitude_estimator_q
-	COMPILE_FLAGS ${MODULE_CFLAGS}
+	COMPILE_FLAGS
+		-Os
 	STACK_MAIN 1200
 	STACK_MAX 1600
 	SRCS